mailmap: Walter Huf name normalization

Signed-off-by: Loic Dachary <loic@dachary.org>
mailmap: koleosfuscus affiliation

Patrick McGarry, Sage Weil and Loic Dachary know who this nickname
belongs to

Signed-off-by: Loic Dachary <loic@dachary.org>
mailmap: Dmitry Smirnov name normalization

Signed-off-by: Loic Dachary <loic@dachary.org>